@Chad Carleton
I think the optimal sep up depends on volume, make, and the present sales team. All Eley's questions, mines, yours, are valid points when considering the optimal plan and each store should carefully consider these.
For example, a BDM manager is more important at a outside metro store with managers and average salespeople 55+ than in a metro store where the managers are 35 and they can be part of the modern process.
@Jerry Thibeau
I disagree with that. A BDC department can make people show that can't buy a car. A BDC with the incentive of a sale will dig deeper to make sure the customer brings all paperwork needed, the right vehicle is prepared, the manager knows the proper trade info, pay off, etc.
I further disagree with you that BDC just controls the appointment and sales the sale. The way things are working in many markets the BDC knows a lot more about the sale than the salesperson that meets the customer for the test drive. I think each dealer needs to evaluate the abilities of their team and set up accordingly (IE if you have a strong BDC team give them more control).
Just to end this in a total disagreement with Jerry (I guess I'm buying drinks at NADA!) I don't think 100K is a generous plan. Nothing is generous if it is properly correlated to sales and therefore earned based on money brought into the company. If I owned a dealer I wish I would pay Heather 250k a year, that would mean we sold a lot of cars at a base + $60/unit cost.